isEven, isOdd, isNegative, isMaxValue, isMinValue, isInfinite, isPositive, isSingleValue.

samples/ui_lib/touch/Scroller.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Implementation of a custom scrolling behavior.
  * This behavior overrides native scrolling for an area. This area can be a
  * single defined part of a page, the entire page, or several different parts
  * of a page.
  *
@@ skipping 335 matching lines @@
     });
   }
 
   void throwDelta(num deltaX, num deltaY, [num decelerationFactor = null]) {
     Coordinate start = _contentOffset;
     Coordinate end = currentTarget;
     int x = end.x.toInt();
     int y = end.y.toInt();
     // If we are throwing in the opposite direction of the existing momentum,
     // cancel the current momentum.
-    if (deltaX != 0 && deltaX.isNegative() != (end.x - start.x).isNegative()) {
+    if (deltaX != 0 && deltaX.isNegative != (end.x - start.x).isNegative) {
       x = start.x;
     }
-    if (deltaY != 0 && deltaY.isNegative() != (end.y - start.y).isNegative()) {
+    if (deltaY != 0 && deltaY.isNegative != (end.y - start.y).isNegative) {
       y = start.y;
     }
     x += deltaX.toInt();
     y += deltaY.toInt();
     throwTo(x, y, decelerationFactor);
   }
 
   void setPosition(num x, num y) {
     _momentum.abort();
     _contentOffset.x = x;
@@ skipping 352 matching lines @@
     for (EventListener listener in _listeners) {
       listener(evt);
     }
   }
 }
 
 class ScrollerScrollTechnique {
   static const TRANSFORM_3D = 1;
   static const RELATIVE_POSITIONING = 2;
 }